Update Yarn

[4/4] Building fresh packages…
success Saved lockfile.
warning Your current version of Yarn is out of date. The latest version is “1.6.0”, while you’re on “1.5.1”.
info To upgrade, run the following command:
$ curl -o- -L https://yarnpkg.com/install.sh | bash
$ typings install

for Windows, try:

npm upgrade --global yarn

yarn@1.6.0
updated 1 package in 2.108s

yarn -v1.6.0

typings install ?

https://www.npmjs.com/package/typings

This package has been deprecated
Author message:

Typings is deprecated in favor of NPM @types — see README for more information